APPARATUS FOR REDUCING FLOOR IMPACT SOUND OF LOW FREQUENCY BAND USING ACOUSTIC META MATERIALS STRUCTURES AND METHOD THEREOF

摘要

The present invention relates to an apparatus for reducing a floor impact sound of a low frequency band using an acoustic meta material and a method thereof. The apparatus for reducing a floor impact sound reduces a floor impact sound of a low frequency band in a floating floor structure where a floor plate forming a floor of an upper floor of a building, a lower plate dividing the upper floor and a lower floor, and a buffer layer arranged between the floor plate and the lower plate are stacked on top of each other. The apparatus for reducing a floor impact sound includes a plurality of acoustic meta materials. Acoustic meta material composites are arranged in group units along a flat area of the floating floor structure to reduce a floor impact sound of a low frequency band in response to a bending wave vibration pattern in a merging mode where the floor plate and the lower plate are simultaneously are bent and vibrated by a floor impact and a non-merging mode where the lower plate is bent and vibrated. According to the present invention, a frequency band having the largest effect on a floor impact sound is selected by merging and non-merging mode occurrence characteristics of a floating floor structure to optimize and apply acoustic meta materials to the floating floor structure to reduce corresponding modes to effectively reduce a floor impact sound of a low frequency band.